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What do you need in the information for? In fantasy settings I tend to just let the story dictate the size. If I want a huge city in the middle of the desert, I'll just put it there and post rationalise food imports on merchant's caravans (even though if you look at it closely it would probably require an endless stream of caravans to keep the city fed).

It is fantasy after all and usually the audience only require a fig leaf of an explanation, not a spreadsheet justifying resources down to the last bushel of wheat. A good example of this is the '1001 Nights' in which all sorts of fantastic places are spoken about which could not possibly exist in real life. But for me that just emphasises the magical nature of the tale.

I'm not sure that there is so much value in taking a detailed numerical / rational approach to fantasy worldbuilding.

If you need the information for a purpose other than fantasy worldbuilding, then the hard numbers may be more relevant.